Oil well choke valve



April 14, 1942. A. 1.. STEWART EIAL OIL WELL. CHOKE YALVE Filed Oct. 25,1941 2 Sheets-Shet 1' l4urey .4. 5 7614 6/77 I] Char/es M Lauder/1 17AINVENTORS Ap 1942- :A. L STEWART HAL 2.279. 59

' OIL WELL CHOKE VALVE Filed Oct. 25, 1941 2 Sheets-Sheet 2 PatentedApr. 14, 1942 v UNITED STATES PATENT" or leg' -ffj r on, vV121.13 31 111; VALVE j Aubrey L. Stewart, Tulsa, Okla, and Charles M. Laudermilk,Shreveport, La.

Application October 25, 1941, Serial No. 416,558.

A further object is to provide a port extending transversely across theplug and through the valve casing and through which transverseportvarious instruments may be passed into the well or blasting bombs whenthe central valve is retracted and pressure substantially cut off andexhausted from the casing.

A further object is to provde a gauge and scale means in connection withthe central maximum flow valve for indicating the amount of flowtherethrough, and to provide the casing, adjacent the fractional needlevalve, with indicia indicating the size of the ports in the plugcontrolled thereby.

A further object is to interpose the device between the master valve andthe separator line valve so that pressure and back pressure can be cutoff from the device and to provide means whereby pressure trapped in thecasing can be exhausted to the atmosphere preparatory to an instrumentinserting operation through the device.

With the above and other objects in View the invention resides in thecombination and arrangement of parts as hereinafter set forth, shown inthe drawings, described and claimed, it being understood that changes inthe precise embodiment of the invention may be made within the scope ofwhat is claimed without departing from the spirit of the invention.

In the drawings:

Figure 1 is a vertical longitudinal sectional 7 view through themultiple choke valve.

Figure 2 is a front elevation of the choke valve.

Figure 3 is a front elevation of the choke valve with the cover plateremoved along with its needle valve. I

Figure 4 is a perspective view of the cover plate and the various valvescarried thereby.

Figure 5 is a perspective View partially in section showing the interiorstructure.

Figure 6 is a view similar to Figure 1, but showing the gauge structureremoved and an attachment applied for lowering a bomb into the well.

Referring to the drawings, the numeral i designates a conventional formof Well casing or portion of a; Christmas tree and 2 the master valvethereon. Secured to the upper end of-the master valve casing 3 by meansof bolts 4 is the choke valve housing 5. Pressed into the chamber 6 ofthe housing 5 is, a tapered plug 1 having a chamber 8 therein incommunication with the chamber 9 of the master valve casing 3. throughthe port ill-. The port lfl is in alineznent with a second port l lclearly shown in Figure 1 and with a port 12 in the upper side of thehousing 5,

the purpose of which will presently appear. The p u Us; ro d d withaplurality of ports 3. n itu nall xten in c n r y j ranged. All of theports !3 are of different di ameters, preferably from one eighth to oneinch, as indicated in Figure 2, and adapted to be selectively opened,singularly or in combination for allowing flow of predetermined amountfrom the well casing through port l0, chamber 8, right hand side ofchamber 6 and into the left hand side 60!. of the chamber so it can bedelivered through the pipe M to a separator when the valve I5 is opened.The plug 1 is provided with an axial needle valve seat It, preferably ofa size to allow flow of full capacity, usually two inches, andcooperating with the seat I6 is a needle valve ll, the shank [8 of whichextends outwardly through the cover plate l9, and is provided with anindicator 2!] cooperating with a scale 2|.

The cover plate I9 also has mounted therein needle valves 22 whichcooperate with valve seats 23 at the right hand ends of the variousports I3. The valves 22 have their stems threadedat 24 in the coverplate 19 and extend through glands 25 and terminate in angular heads 26adapted to receive a wrench for opening and closing the same.

It Will be seen that by manipulating the various needle valves anyfractional part of the capacity may be allowed to pass and when desiredthe needle valve I! can be opened for full capacity.

When it is desired to insert instruments, for instance a bomb 21, intothe well the master valve 2 is closed to cut oil" the pressure, and thevalve i5 is also closed to cut off back pressure from the separator.After the closing of these valves a three way valve 28 is opened forexhausting to the atmosphere the pressure within the chamber of thehousing 5. valve is carried by a dome 29 bolted to the upper side of thehousing and then the dome 29 is removed and replaced by a fitting 30 asshown in Figure 6. that is after the bomb 2! has been The three Wayplaced in the device. The bomb 21 is carried by a shooter line 3| whichextends upwardly over a sheave 32, hence it will be seen that the bombthe ports l2, H, H) and Ifia are in alinement,-

hence instruments may be easily inserted the plug in a transversedirection. i

From the above it will be seen that a multiple choke valve is provided,simple in construction,

one wherein the maximum capacity may be obtained in a single valve orany fractional part combinations thereof may be obtained. It will alsobe seen that means is provided in connection with the device wherebyinstruments may beinsertedin' the welltransversely through the chokevalve. J 1

The invention having been set'fort-h "what is claimed as new and usefulis:

l. A choke valve comprising a housing having a chamber therein, meansfor attaching said housing to a pressure supplying line, a plug in thechamber of said housing and having a plurality of longitudinallyextending ports circumferentially arranged and fex'tending entirelythrough the plug, said plug having a transverse bore registering withalined ports in the housing and communicating with an axial portextending through the plug, a cover plate for said housing,

tln ough I port controlled by the master valve is of maxialinementwiththe transverse bore.

3.1A device as set forth in claim 1 whereinthe concentric ports are offractional size in relation to the axial port.

4 A device as set forth in claim 1 wherein the murn capacity size tocarry the full capacity of saidpressure supply line.

5. The combination with a multiple choke valve having aplug in thechamber thereof and a plurality of valve controlled ports extendingthrough the plug longitudinally, said plug being disposed ina-housingcarried by a well pipe, oftransversely alined port'scarried by thehousing, plug and Well pipe and forming means for allowing the insertionof an instrument into the well' pipe through the housing and plug and acover them her removably mounted over the'upper transverse port of thehousing. l

6. A device as set forth in claim 1 including valve seats carried by theplug ports for the said valves, said cover plate having stuifing boxesthrough which the valve stems extend and means whereby said-"valves andvalve stems can be axially moved.

AUBREY L. STEWART.

CHARLESM, LAUDERMILK.

